[(xy+2)(xy-2)-2x^2y^2+4]/xy(其中x=10y=25分之一)

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[(xy+2)(xy-2)-2x^2y^2+4]/xy(其中x=10y=25分之一)
[(xy+2)(xy-2)-2x^2y^2+4]/xy(其中x=10y=25分之一)

[(xy+2)(xy-2)-2x^2y^2+4]/xy(其中x=10y=25分之一)
[（xy+2）（xy-2）-2x2y2+4]÷（xy）
=（x2y2-4-2x2y2+4）÷xy
=-x2y2÷xy
=-xy,
当 x=10,y=1/25时,原式= -2/5．

原式=(x 2;y 2;-4-2x 2;y 2;+4)÷xy =-x 2;y 2;÷xy =-xy =-10×(-1/25) =2/5 原式=（（xy）^2-4-2(xy)^2+4)/xy

[(xy+2)(xy-2)-2x²y²+4]/xy
= [(x²y²-4)-2x²y²+4]/xy
= [-x²y²]/xy
= -xy
= - 10×25
= -250

x^2-xy/xy-y^2约分 2x²y-3(2xy-xy)-xy (x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy) （x^2+xy/x-y)/（xy/x-y)计算 ((xy+2)(xy-2)-2x²y²+5(xy-y)²)÷(2xy) .(x+y-2)(x+y-2xy)+(xy-1)^2 (x^2-xy)y÷y-x/xy怎么做? xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2 （X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程初二数学化简分式x^2 -y^2/xy - xy-y^2/xy-x^2x^2 -y^2/xy - xy-y^2/xy-x^2 （y/(x^2-xy)+x/(y^2-xy))除以(x-y)/(xy) 3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程计算：3xy(x²y-xy²+xy)-xy²(2x-xy+2x）已知 x+y＝4,xy＝2,求2xy+4xy+2xy x^2-xy-6y^2+3xy+y+2 (xy-x²)÷(x²-2xy+y²/xy)×（x-y/x²） x-y/x²÷x²-2xy+y²/xy*（xy-x²）计算（xy-y^2)÷x-y/xy